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The only reason they cannot use higher concentrations is because they cheap-out on the particulate filter (DPF) burn-off process, choosing to dump fuel into the engine on the exhaust stroke to fuel the DPF instead of plumbing an injector into the DPF itself. Biodiesel doesn't vaporize as well, and ends up in the sump.
Diesel engine manufacturers are not going to improve their systems by themselves, we need a national biodiesel standard. B5 is totally weak.
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I'm not coasting, I'm shifting slowly.
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